Discovering this resource was a game-changer!
I have some code that can serve as a solid foundation for your project.
background: #1e5799; /* For older browsers */
background: -moz-linear-gradient(-45deg, #1e5799 0%, #2989d8 50%, #207cca 63%, #7db9e8 100%); /* Firefox 3.6+ */
background: -webkit-gradient(linear, left top, right bottom, color-stop(0%,#1e5799), color-stop(50%,#2989d8), color-stop(63%,#207cca), color-stop(100%,#7db9e8)); /* Chrome and Safari 4+ */
background: -webkit-linear-gradient(-45deg, #1e5799 0%,#2989d8 50%,#207cca 63%,#7db9e8 100%); /* Chrome 10+ and Safari 5.1+ */
background: -o-linear-gradient(-45deg, #1e5799 0%,#2989d8 50%,#207cca 63%,#7db9e8 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(-45deg, #1e5799 0%,#2989d8 50%,#207cca 63%,#7db9e8 100%); /* Internet Explorer 10+ */
background: linear-gradient(135deg, #1e5799 0%,#2989d8 50%,#207cca 63%,#7db9e8 100%); /* W3C Standard */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#1e5799', endColorstr='#7db9e8',GradientType=1 ); /* Fallback for IE6-9 with horizontal gradient */